My tank is pretty new, it's only been up and running for about two months now. I returned from a vacation and saw this large sponge in the intake chamber of my sump. It's pretty large for the amount of time the tank has been up, and it's pretty white with some minor discolorations. Here are some photos, I wasn't able to get up next to it, but hopefully these will show it well enough. Should I have any concerns?